Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c33888ebcf470d1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 04:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad89e45ddbdc62535db42a0744b71042 SHA-1: 54fc7fd98a3bba8cb60a7da35989950bf0b94620 SHA-256: 8c33888ebcf470d171039a214e8b94497967a7a7e11ba07d27cdd2412cc45886
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=uc+surface+android PDF link annotation
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/juvizugen.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/falagig.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/11297187402.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/55003890141.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/47369389059.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/74476328996.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/64203184907.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/waxarivofa.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/17659504623.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sixedaxovox.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/51053202290.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/24/75089245559.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/sepefixofalisegezovudi.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/28268148786.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/depovowuv.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sebuvizavasexuvofajuf.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/9371471428.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/58399368870.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/wobeluzizifupirejul.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/kuxiraxobonur.pdfIn PDF document text
    • http://vaithun.net/upload/files/ponorevewifuz.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/kawotejumireza.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/dakesobonijetiralipip.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/78368149845.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144c81a84e12---voxajat.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD9 10432 bytes
SHA-256: 4d8e7257227b27ab6224d165eac47df497a78cadccb6108b6d79dec7de38f69c
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 17280 bytes
SHA-256: 2727294742aedaf23ae94991e342243096c448be7f38df90b5eb15186fd1d3af
font_02_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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